I live in an apartment. Recently, it was damaged, and we are moving into a temporary place while they remodel this one. While cleaning the temp place, I noticed the carpets are stiff and matted. So stiff, that my vacuum wouldn't even pull up the nap of the carpet when I vacuumed. After some quick research, I concluded that the cause is too much soap left in the carpet.
My solution was to rinse the carpets with vinegar to break up the soap residue. However, I have a small machine, it only holds 1 gallon of water. This would take a lot of refills and trips to the sink. There had to be a better way.
After considering my options, I decided a trip to the hardware store was in order. I purchased a 2 gallon weed sprayer, and came home. I assembled it, and had to reassemble it because I don't know how to read directions thoroughly.
I mixed 1 gallon of white vinegar with 1 gallon of warm water. You cannot use hot water in a weed sprayer, it can damage the pump or even worse, when put under pressure, could explode. So, to be on the safe side, I just used warm water.
I then pumped it up, and sprayed the entire carpet using the fan spray on my sprayer. I didn't want to saturate the carpet, just wet it enough so the vinegar could do it's thing. I waited 10 minutes, then ran a hot water rinse over the carpets with my shampooer. It worked better than running just the shampooer over the carpets! The carpet was starting to fluff up again!
The water that was pulled out of the carpet was a milky tan color, leaving me to believe my assumptions about the soap were correct. When dirt is pulled out, it is a much darker color.